diff --git a/Cargo.toml b/Cargo.toml
index 3c4b7c4..88aa0e4 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -6,7 +6,7 @@ members = [
 
 [package]
 name = "fast_log"
-version = "1.4.19"
+version = "1.4.20"
 description = "Rust async log High-performance asynchronous logging"
 readme = "Readme.md"
 authors = ["ce <zhuxiujia@qq.com>"]
@@ -19,7 +19,7 @@ default = ["runtime_thread"]
 gzip = ["flate2"]
 
 runtime_thread = []
-runtime_cogo = ["cogo"]
+runtime_mco = ["mco"]
 
 [dependencies]
 chrono = { version = "0.4", features = ["serde"] }
@@ -30,7 +30,7 @@ crossbeam-utils = "0.8"
 crossbeam = "0.8"
 crossbeam-channel = "0.5"
 parking_lot = "0.11"
-cogo = {version = "0.1", optional = true }
+mco = {version = "0.1", optional = true }
 once_cell = "1.9"
 
 
diff --git a/example/Cargo.toml b/example/Cargo.toml
index 537bf13..6d8d7b2 100644
--- a/example/Cargo.toml
+++ b/example/Cargo.toml
@@ -43,7 +43,7 @@ crossbeam-channel = "0.5"
 crossbeam-utils = "0.8"
 crossbeam = "0.8"
 chrono = { version = "0.4", features = ["serde"] }
-cogo = "0.1"
+mco = "0.1"
 
 # features=["lz4"] or add features=["zip","lz4"] if you need lz4 packer
 fast_log = { path = "../", features = ["lz4","zip","gzip"]}
diff --git a/src/runtime.rs b/src/runtime.rs
index f985bbd..aa01d94 100644
--- a/src/runtime.rs
+++ b/src/runtime.rs
@@ -1,75 +1,75 @@
 
 use std::time::Duration;
 
-/// if use cogo runtime
-#[cfg(feature = "cogo")]
-pub type TcpListener = cogo::net::TcpListener;
-#[cfg(feature = "cogo")]
-pub type TcpStream = cogo::net::TcpStream;
-#[cfg(feature = "cogo")]
-pub type Receiver<T> = cogo::std::sync::channel::Receiver<T>;
-#[cfg(feature = "cogo")]
-pub type Sender<T> = cogo::std::sync::channel::Sender<T>;
-#[cfg(feature = "cogo")]
-pub type JoinHandle<T> = cogo::coroutine::JoinHandle<T>;
-#[cfg(feature = "cogo")]
-pub type Mutex<T> = cogo::std::sync::Mutex<T>;
-#[cfg(feature = "cogo")]
-pub type WaitGroup = cogo::std::sync::WaitGroup;
+/// if use mco runtime
+#[cfg(feature = "mco")]
+pub type TcpListener = mco::net::TcpListener;
+#[cfg(feature = "mco")]
+pub type TcpStream = mco::net::TcpStream;
+#[cfg(feature = "mco")]
+pub type Receiver<T> = mco::std::sync::channel::Receiver<T>;
+#[cfg(feature = "mco")]
+pub type Sender<T> = mco::std::sync::channel::Sender<T>;
+#[cfg(feature = "mco")]
+pub type JoinHandle<T> = mco::coroutine::JoinHandle<T>;
+#[cfg(feature = "mco")]
+pub type Mutex<T> = mco::std::sync::Mutex<T>;
+#[cfg(feature = "mco")]
+pub type WaitGroup = mco::std::sync::WaitGroup;
 
-#[cfg(feature = "cogo")]
+#[cfg(feature = "mco")]
 pub fn chan<T>() -> (Sender<T>, Receiver<T>) {
-    cogo::chan!()
+    mco::chan!()
 }
 
-#[cfg(feature = "cogo")]
+#[cfg(feature = "mco")]
 pub fn sleep(d: Duration) {
-    cogo::coroutine::sleep(d)
+    mco::coroutine::sleep(d)
 }
 
-#[cfg(feature = "cogo")]
+#[cfg(feature = "mco")]
 pub fn spawn<F>(f: F) -> JoinHandle<()> where F: FnOnce() + std::marker::Send + 'static {
-    cogo::coroutine::Builder::new().stack_size(0x1000).spawn(f)
+    mco::coroutine::Builder::new().stack_size(0x1000).spawn(f)
 }
 
-#[cfg(feature = "cogo")]
+#[cfg(feature = "mco")]
 pub fn spawn_stack_size<F>(f: F, stack_size:usize) -> JoinHandle<()> where F: FnOnce() + std::marker::Send + 'static {
-    cogo::coroutine::Builder::new().stack_size(stack_size).spawn(f)
+    mco::coroutine::Builder::new().stack_size(stack_size).spawn(f)
 }
 
 
-/// if not cogo
-#[cfg(not(feature = "cogo"))]
+/// if not mco
+#[cfg(not(feature = "mco"))]
 pub type TcpListener = std::net::TcpListener;
-#[cfg(not(feature = "cogo"))]
+#[cfg(not(feature = "mco"))]
 pub type TcpStream = std::net::TcpStream;
-#[cfg(not(feature = "cogo"))]
+#[cfg(not(feature = "mco"))]
 pub type Receiver<T> = crossbeam::channel::Receiver<T>;
-#[cfg(not(feature = "cogo"))]
+#[cfg(not(feature = "mco"))]
 pub type Sender<T> = crossbeam::channel::Sender<T>;
-#[cfg(not(feature = "cogo"))]
+#[cfg(not(feature = "mco"))]
 pub type JoinHandle<T> = std::thread::JoinHandle<T>;
-#[cfg(not(feature = "cogo"))]
+#[cfg(not(feature = "mco"))]
 pub type Mutex<T> = std::sync::Mutex<T>;
-#[cfg(not(feature = "cogo"))]
+#[cfg(not(feature = "mco"))]
 pub type WaitGroup = crossbeam_utils::sync::WaitGroup;
 
-#[cfg(not(feature = "cogo"))]
+#[cfg(not(feature = "mco"))]
 pub fn chan<T>() -> (Sender<T>, Receiver<T>) {
     crossbeam::channel::unbounded()
 }
 
-#[cfg(not(feature = "cogo"))]
+#[cfg(not(feature = "mco"))]
 pub fn sleep(d: Duration) {
     std::thread::sleep(d)
 }
 
-#[cfg(not(feature = "cogo"))]
+#[cfg(not(feature = "mco"))]
 pub fn spawn<F>(f: F) -> JoinHandle<()> where F: FnOnce() + std::marker::Send + 'static {
     std::thread::spawn(f)
 }
 
-#[cfg(not(feature = "cogo"))]
+#[cfg(not(feature = "mco"))]
 pub fn spawn_stack_size<F>(f: F, stack_size:usize) -> JoinHandle<()> where F: FnOnce() + std::marker::Send + 'static {
     std::thread::spawn(f)
 }
\ No newline at end of file